Detector difference maps of Planck-HFI 857 GHz real data. For all detector pairs, detector difference maps are computed for three distinct cases: the mapmaking of Planck-HFI 857 GHz real data using a classic destriping approach (not shown), the mapmaking of Planck-HFI 857 GHz real data using SRoll2 to produce a direct fit of a synthetic FSL simulation as a template (SRoll2, two leftmost columns), and the mapmaking of Planck-HFI 857 GHz real data using 1000 iterations of the 2D Decoder CNN exploiting data augmentation to include interdetector residuals in the learning dataset (CNN2D-DA, two rightmost columns).